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; Exclamation mark : There is no standard representation for the [[exclamation mark]] [''' ! '''], although the {{sc| {{overline|KW}} }} [[Digraph (orthography)|digraph]] ({{morse|dash|dot|dash|dot|dash|dash}}) was proposed in the 1980s by the [[Heathkit]] Company.{{efn|[[Heathkit]] was a popular, long-standing vendor of kits for amateur radio equipment.}} While Morse code translation software prefers the Heathkit version, on-air use is not yet universal, as some amateur radio operators in North America and the Caribbean continue to use the older {{sc| {{overline|MN}} }} digraph ({{morse|dash|dash|dash|dot}}){{efn|name=exclamation_note| {{sc| {{overline|MN}} }} or {{sc| {{overline|OE}} }}, {{morse|dash|dash|dash|dot}}, which some telegraphers unofficially use for an exclamation mark [''' ! '''], is shared with unofficial letters {{sc|Ö}}, {{sc|Ó}}, and {{sc|Ø}} used in some non-Latin alphabets.}} copied over from [[American Morse code|American Morse landline code]].
; Currency symbols : The ITU has never formally codified any [[currency symbol]]s into Morse code: The unambiguous [[ISO 4217]] currency codes are preferred for transmission (e.g. [[CNY]], [[EUR]], [[GBP]], [[JPY]], [[South Korean won|KRW]], [[USD]], etc.). However, the {{nobr|symbol [''' $ ''']}} was represented in the [[Phillips Code]]{{efn|The [[Phillips Code]] was a huge collection of abbreviations used on land line telegraphy.}} as two characters "'''{{sc|SX}}'''"; eventually operators dropped the intervening space and merged the two letter code or abbreviation into the single unofficial punctuation encoding {{sc| {{overline|SX}} }} ({{morse|dot|dot|dot|dash|dot|dot|dash}}).
; Ampersand [''' & '''] : The suggested unofficial encoding of the [[ampersand]] [''' & '''] sign listed above,{{efn|name=E_S_for_&_note}} often shown as {{sc| {{overline|AS}} }}, is also the official Morse [[Prosigns for Morse code|prosign]] for ''wait''. In addition, the [[American Morse code|American Morse encoding]] for an ampersand ({{morse|dot|aspace|dot|dot|dot}}) was similar to '''{{sc|ES}}''' ({{morse|dot}}{{morse|dot|dot|dot}}) and [[Amateur radio operators|hams]] have nearly universally carried over this use as an abbreviation for "and" (e.g. {{sc|WX HR COLD ES RAINY}} "the weather here is cold and rainy"). Since '''{{sc|ES}}''' is well established and slightly quicker than {{sc| {{overline|AS}} }}, there is no motivation for replacing it.
; Keyboard "at" sign [''' @ '''] : On 24 May 2004 – the 160th anniversary of the first public Morse telegraph transmission – the Radiocommunication Bureau of the International Telecommunication Union ([[ITU-R]]) formally added the [''' @ '''] ("[[commercial at]]" or "commat") character to the official Morse character set, using the sequence denoted by the {{sc| {{overline|AC}} }} digraph: {{morse|dot|dash|dash|dot|dash|dot}} .<ref name=ITU-R-M-1677/><ref name=ARRL-News-2003-12-10/>
: This sequence was reported to have been chosen to represent "A[t] C[ommercial]", or a {{nobr|letter 'a'}} inside a swirl represented by a {{nobr|letter 'C'.}} The new character facilitates sending [[email|e‑mail]] addresses by Morse code, and is notable since it is the first official addition to the Morse set of characters since [[World War I]].<ref name=ARRL-News-2003-12-10/>
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