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Simply
The therefore sign is It is Unicode character U+2234, the short cut is ALT-8765
Depending on the usage of the word, sign is already a verb.
For example "to sign something" is an action and therefore a verb.
There is not a sing for the word recipe , therefore you have to spell the word out.
Snoop Dogg was born on October 20, 1971 and therefore was born under the sign of Libra.
Three dots in an upward V sign mean "therefore".