diff --git a/doc/C/func.defs b/doc/C/func.defs
index 54167ee56..0076fdecb 100644
--- a/doc/C/func.defs
+++ b/doc/C/func.defs
@@ -2913,11 +2913,11 @@ The depreciation coefficient used is:
 
 @CATEGORY=Logic
 @FUNCTION=IFNA
-@SHORTDESC=test for #NA! error
+@SHORTDESC=test for #N/A error
 @SYNTAX=IFNA(x,y)
-@ARGUMENTDESCRIPTION=@{x}: value to test for #NA! error
+@ARGUMENTDESCRIPTION=@{x}: value to test for #N/A error
 @{y}: alternate value
-@DESCRIPTION=This function returns the first value, unless that is #NA!, in which case it returns the second.
+@DESCRIPTION=This function returns the first value, unless that is #N/A, in which case it returns the second.
 @SEEALSO=IF,ISERROR
 
 @CATEGORY=Logic
@@ -2961,7 +2961,7 @@ The depreciation coefficient used is:
 @{value1}: first result value
 @{choice2}: second choice value
 @{value2}: second result value
-@DESCRIPTION=This function compares the reference value, @{ref}, against the choice values, @{choice1} etc., and returns the corresponding result value when it finds a match.  The choices may be followed by a default value to use.  If there are no choices that match and no default value, #NA! is return.
+@DESCRIPTION=This function compares the reference value, @{ref}, against the choice values, @{choice1} etc., and returns the corresponding result value when it finds a match.  The choices may be followed by a default value to use.  If there are no choices that match and no default value, #N/A is return.
 @SEEALSO=IF,IFS
 
 @CATEGORY=Logic
diff --git a/doc/C/functions.xml b/doc/C/functions.xml
index c41de8225..91e916c0f 100644
--- a/doc/C/functions.xml
+++ b/doc/C/functions.xml
@@ -9276,7 +9276,7 @@
           <function>IFNA</function>
         </refname>
         <refpurpose>
-        test for #NA! error
+        test for #N/A error
       </refpurpose>
       </refnamediv>
       <refsynopsisdiv>
@@ -9284,12 +9284,12 @@
       </refsynopsisdiv>
       <refsect1>
         <title>Arguments</title>
-        <para><parameter>x</parameter>: value to test for #NA! error</para>
+        <para><parameter>x</parameter>: value to test for #N/A error</para>
         <para><parameter>y</parameter>: alternate value</para>
       </refsect1>
       <refsect1>
         <title>Description</title>
-        <para>This function returns the first value, unless that is #NA!, in which case it returns the second.</para>
+        <para>This function returns the first value, unless that is #N/A, in which case it returns the second.</para>
       </refsect1>
       <refsect1>
         <title>See also</title>
@@ -9443,7 +9443,7 @@
       </refsect1>
       <refsect1>
         <title>Description</title>
-        <para>This function compares the reference value, <parameter>ref</parameter>, against the choice values, <parameter>choice1</parameter> etc., and returns the corresponding result value when it finds a match.  The choices may be followed by a default value to use.  If there are no choices that match and no default value, #NA! is return.</para>
+        <para>This function compares the reference value, <parameter>ref</parameter>, against the choice values, <parameter>choice1</parameter> etc., and returns the corresponding result value when it finds a match.  The choices may be followed by a default value to use.  If there are no choices that match and no default value, #N/A is return.</para>
       </refsect1>
       <refsect1>
         <title>See also</title>
diff --git a/plugins/fn-info/functions.c b/plugins/fn-info/functions.c
index ebb01b92e..0ef6bd5b2 100644
--- a/plugins/fn-info/functions.c
+++ b/plugins/fn-info/functions.c
@@ -1798,7 +1798,7 @@ gnumeric_type (GnmFuncEvalInfo *ei, GnmValue const * const *argv)
 static GnmFuncHelp const help_getenv[] = {
         { GNM_FUNC_HELP_NAME, F_("GETENV:the value of execution environment variable @{name}")},
         { GNM_FUNC_HELP_ARG, F_("name:the name of the environment variable")},
-	{ GNM_FUNC_HELP_NOTE, F_("If a variable called @{name} does not exist, #N/A! will be returned.") },
+	{ GNM_FUNC_HELP_NOTE, F_("If a variable called @{name} does not exist, #N/A will be returned.") },
 	{ GNM_FUNC_HELP_NOTE, F_("Variable names are case sensitive.") },
 	{ GNM_FUNC_HELP_EXAMPLES, "=GETENV(\"HOME\")" },
         { GNM_FUNC_HELP_END}
diff --git a/plugins/fn-logical/functions.c b/plugins/fn-logical/functions.c
index 1bf3552df..a2e9be09e 100644
--- a/plugins/fn-logical/functions.c
+++ b/plugins/fn-logical/functions.c
@@ -243,10 +243,10 @@ gnumeric_iferror (GnmFuncEvalInfo *ei, GnmValue const * const *argv)
 /***************************************************************************/
 
 static GnmFuncHelp const help_ifna[] = {
-	{ GNM_FUNC_HELP_NAME, F_("IFNA:test for #NA! error") },
-	{ GNM_FUNC_HELP_ARG, F_("x:value to test for #NA! error") },
+	{ GNM_FUNC_HELP_NAME, F_("IFNA:test for #N/A error") },
+	{ GNM_FUNC_HELP_ARG, F_("x:value to test for #N/A error") },
 	{ GNM_FUNC_HELP_ARG, F_("y:alternate value") },
-	{ GNM_FUNC_HELP_DESCRIPTION, F_("This function returns the first value, unless that is #NA!, in which case it returns the second.") },
+	{ GNM_FUNC_HELP_DESCRIPTION, F_("This function returns the first value, unless that is #N/A, in which case it returns the second.") },
         { GNM_FUNC_HELP_EXAMPLES, "=IFNA(12,14)" },
         { GNM_FUNC_HELP_EXAMPLES, "=IFNA(1/0,14)" },
         { GNM_FUNC_HELP_EXAMPLES, "=IFNA(NA(),14)" },
@@ -313,7 +313,7 @@ static GnmFuncHelp const help_switch[] = {
 	{ GNM_FUNC_HELP_ARG, F_("value1:first result value") },
 	{ GNM_FUNC_HELP_ARG, F_("choice2:second choice value") },
 	{ GNM_FUNC_HELP_ARG, F_("value2:second result value") },
-	{ GNM_FUNC_HELP_DESCRIPTION, F_("This function compares the reference value, @{ref}, against the choice values, @{choice1} etc., and returns the corresponding result value when it finds a match.  The choices may be followed by a default value to use.  If there are no choices that match and no default value, #NA! is return.") },
+	{ GNM_FUNC_HELP_DESCRIPTION, F_("This function compares the reference value, @{ref}, against the choice values, @{choice1} etc., and returns the corresponding result value when it finds a match.  The choices may be followed by a default value to use.  If there are no choices that match and no default value, #N/A is return.") },
         { GNM_FUNC_HELP_EXAMPLES, "=SWITCH(WEEKDAY(TODAY()),0,\"Sunday\",1,\"Saturday\",\"not weekend\")" },
 	{ GNM_FUNC_HELP_SEEALSO, "IF,IFS" },
 	{ GNM_FUNC_HELP_END }
diff --git a/plugins/fn-random/functions.c b/plugins/fn-random/functions.c
index f247acbfc..3718c534b 100644
--- a/plugins/fn-random/functions.c
+++ b/plugins/fn-random/functions.c
@@ -832,8 +832,8 @@ static GnmFuncHelp const help_simtable[] = {
 					"valid simulation models you should have the same number of "
 					"values @{dN} for all decision variables.  If the simulation is run "
 					"more rounds than there are values defined, SIMTABLE returns "
-					"#N/A! error (e.g. if A1 contains `=SIMTABLE(1)' and A2 "
-					"`=SIMTABLE(1,2)', A1 yields #N/A! error on the second round).\n"
+					"#N/A error (e.g. if A1 contains `=SIMTABLE(1)' and A2 "
+					"`=SIMTABLE(1,2)', A1 yields #N/A error on the second round).\n"
 					"The successive use of the simulation tool also requires that you "
 					"give to the tool at least one input variable having RAND() or "
 					"any other RAND<distribution name>() function in it. "
diff --git a/plugins/fn-stat/functions.c b/plugins/fn-stat/functions.c
index 6cfdb1e7f..7be0a6334 100644
--- a/plugins/fn-stat/functions.c
+++ b/plugins/fn-stat/functions.c
@@ -2841,7 +2841,7 @@ static GnmFuncHelp const help_percentrank[] = {
 	{ GNM_FUNC_HELP_NOTE, F_("If @{significance} is less than one, this function returns a #NUM! "
 				 "error.") },
 	{ GNM_FUNC_HELP_NOTE, F_("If @{x} exceeds the largest value or is less than the smallest "
-				 "value in @{array}, this function returns an #N/A! error.") },
+				 "value in @{array}, this function returns an #N/A error.") },
 	{ GNM_FUNC_HELP_NOTE, F_("If @{x} does not match any of the values in @{array} or @{x} matches "
 				 "more than once, this function interpolates the returned value.") },
 	{ GNM_FUNC_HELP_SEEALSO, "LARGE,MAX,MEDIAN,MIN,PERCENTILE,QUARTILE,SMALL"},
@@ -2945,7 +2945,7 @@ static GnmFuncHelp const help_percentrank_exc[] = {
 	{ GNM_FUNC_HELP_NOTE, F_("If @{significance} is less than one, this function returns a #NUM! "
 				 "error.") },
 	{ GNM_FUNC_HELP_NOTE, F_("If @{x} exceeds the largest value or is less than the smallest "
-				 "value in @{array}, this function returns an #N/A! error.") },
+				 "value in @{array}, this function returns an #N/A error.") },
 	{ GNM_FUNC_HELP_NOTE, F_("If @{x} does not match any of the values in @{array} or @{x} matches "
 				 "more than once, this function interpolates the returned value.") },
 	{ GNM_FUNC_HELP_SEEALSO, "LARGE,MAX,MEDIAN,MIN,PERCENTILE,PERCENTILE.EXC,QUARTILE,QUARTILE.EXC,SMALL"},
