Hand gesture used as a taunt
The loser is a hand gesture made by extending the right thumb and index fingers, leaving the other fingers closed to create the letter L, interpreted as "loser", and generally given as a demeaning sign. Sometimes this is accompanied by raising the hand to the giver's forehead.
The gesture was popular in the 1990s, partly popularized by the 1994 movie "".
Usage of an "L" hand sign in specific contexts.
In Brazil, the "L" is the political symbol of voting in Lula da Silva for president. Also, in Brazil, Germán Cano, soccer player from Fluminense, use the L to commemorate when he scores a goal. 
Also in Brazil, an "L" handsign is used for cheering for Brazilian e-sports players from LOUD organization (e.g. during "VCT 2023: LOCK//IN" event in São Paulo).
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