Hashtag

#Schlagwort vs. #Stichwort vs. #Hashtag
#Verschlagwortung #Kontextualisierung #Suchbegriff
#Codewort #Identifikationsmuster #Zugehörigkeit #Gruppenbildung
#Akkumulation #Wortwolke
#Wortprägung #Wortbildung
#Satzelement #Überschrift

digitale Herkunft:

Wikipedia:
"... when placed next to a symbol or a number, and around 1973, '#' was introduced in the C programming language to indicate special keywords that the C preprocessor had to process first. The pound sign was adopted for use within IRC (Internet Relay Chat) networks around 1988 to label groups and topics.[14] Channels or topics that are available across an entire IRC network are prefixed with a hash symbol # (as opposed to those local to a server, which uses an ampersand '&') ..."

ab 2007 #microblogging