Morse code (esp. the code)
 (radio) call sign;  (radio) call letters
 (of) opposite sign;  (having an) opposite sign
 repetition symbol;  repetition of the previous character
 signal converter;  inverter
 encoding (act of encoding a signal)
 code division multiple access;  CDMA
 Error-Detecting Code;  EDC
 Error-Correcting Code;  ECC
 pulse-code modulation;  PCM
 error-detecting code;  self-checking code
 error-detecting code;  self-checking code
 multicode core concrete syntax
 multicode basic concrete syntax
 multicode concrete syntax
 ISI;  intersymbol interference
 CDMA;  code division multiple access
 CDMA;  Code Division Multiple Access
 character-coded-data-element;  CC data element
 supplementary symbol (number, punctuation, etc.)
 ellipsis points (e.g. ...);  suspension points;  apostrophe
 Wilcoxon signed-rank test
 shorthand symbol;  stenograph;  stenographic character
 Bopomofo;  Zhuyin fuhao;  Chinese transliteration system now used mainly in Taiwan
 diacritical mark;  diacritic
 (of) matching sign;  (having a) matching sign