octothorn
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octothorpe — noun /ˈɒktəʊθɔːp,ˈɑːktoʊθɔːrp/ a) A name for the hash or square symbol (), used mainly in telephony and computing Octothorp is the b) on a push button telephone. Rumor at the telephone company is that a man named Charles B. Octothorp, wanting to… … Wiktionary
hash sign — noun /hæʃ saɪn/ the number sign (). Syn: hash key, hash, number sign, octothorn, octothorpe, pound sign, sharp sign … Wiktionary