HJ may refer to:

Science, technology, and mathematics

Hall–Janko group In the area of modern algebra known as group theory, the Janko group ''J2'' or the Hall-Janko group ''HJ'' is a sporadic simple group of Order (group theory), order : 2733527 = 604800 : ≈ 6. History and properties ''J2'' is ...

, a mathematical group * U.S. code for a cryptographic key change; see

cryptoperiod A cryptoperiod is the time span during which a specific cryptographic key is authorized for use. Common government guidelines range from 1 to 3 years for asymmetric cryptography, and 1 day to 7 days for symmetric cipher traffic keys. Factors to co ...

Other uses

* , a two-letter combination used in some languages ** /hj/, a pronunciation cluster, sometimes reduced * Holden HJ, an Australian car 1974-1976 *

Hajji Hajji ( ar, الحجّي; sometimes spelled Hadji, Haji, Alhaji, Al-Hadj, Al-Haj or El-Hajj) is an honorific title which is given to a Muslim who has successfully completed the Hajj to Mecca. It is also often used to refer to an elder, since ...

(Hj.), an Islamic honorific * ''hic jacet'' ('here lies'),

Latin phrase __NOTOC__ This is a list of Wikipedia articles of Latin phrases and their translation into English. ''To view all phrases on a single, lengthy document, see: List of Latin phrases (full)'' The list also is divided alphabetically into twenty pag ...

on gravestones *

Hilal-i-Jurat The Hilal-e-Jurat ( ur, , as if it were ''Halāl-e-Jurāt''; English: Crescent of Courage , sometimes spelled as Hilal-e-Jur'at, Hilal-e-Jurat, Hilal-i-Jurrat and Hilal-i-Juraat)Various official sources that are highly reputable spell the name ...

, post-nominal for Pakistan honour *

Hitler-Jugend The Hitler Youth (german: Hitlerjugend , often abbreviated as HJ, ) was the youth organisation of the Nazi Party in Germany. Its origins date back to 1922 and it received the name ("Hitler Youth, League of German Worker Youth") in July 1926. ...

(Hitler Youth) * Tasman Cargo Airlines, IATA airline designator *

Handjob A handjob, also spelled hand job, is a sex act, performed as either foreplay or as non-penetrative sex, that involves the manual stimulation of the penis or scrotum by another person to induce an erection for sexual pleasure, sexual arousal a ...

{{disambiguation