noun
swastika; fylfot; gammadion
Primarily the counterclockwise Buddhist swastika, used as a temple symbol on maps. Distinct from the Nazi hakenkreuz, though the shape is similar.
See also: ハーケンクロイツ
地図で卍のマークはお寺を表します。
On maps, the 卍 mark indicates a Buddhist temple.
noun
swastika-shaped family crest
A traditional Japanese family crest (kamon) featuring a swastika design.
あの家の家紋は卍です。
That family's crest is a swastika.
interjection
wow; yeah; awesome; ugh; yuck; really; let's go
Only when written 卍
Internet slang interjection used for emphasis, excitement, or disgust. Often appears at the start or end of a sentence, or alone. Restricted to the kanji form 卍.
卍、今日のテスト満点だった！
Wow, I got a perfect score on today's test!
このラーメン、マジ卍うまい。
This ramen is seriously awesome.
Specifically the Nazi swastika (hakenkreuz), a clockwise tilted symbol. 卍 usually refers to the Buddhist symbol and is counterclockwise.
From Sanskrit svastika, via Chinese. The character 卍 has been used in East Asian Buddhism for centuries. The slang interjection use originated online, possibly from the shape's energetic or chaotic feel.