@

Etymology 1
edit
Symbol
 
(computing) The symbol used as a separator between a username and a domain name in an e-mail address.
(Internet slang) used to attach a qualifier to someone's name 
cosMo@暴ぼう走そうP
cosMo@BōsōP
cosMo@Bōsō-P
Usage notes
edit
The symbol is called 単たん価か記き号ごう (tankakigō), アットマーク (atto māku) or アット (atto).

Etymology 2
edit
Pronunciation
edit
IPA(key): [a̠t̚to̞]
Particle
edit
@アット • (atto) 

at a rate of
500ごひゃく @アット 5ご円えん
gohyaku atto go-en
500 items at 5 yen each
Etymology 3
edit
Pronunciation
edit
IPA(key): [de̞]
Particle
edit
@で • (de) 

(Internet slang) alternative form of で (de, “at”, indicating a location at which something happens)
Etymology 4
edit
Pronunciation
edit
IPA(key): [a̠to̞]
Particle
edit
@あと • (ato) 

(slang, gaming) alternative form of あと (ato, “remaining”)
@あと 5ご 個こ
ato go ko
five items remaining
@あと 1いち時じ間かんで寝ねる
ato ichi-jikan de neru
I'll go to bed in an hour