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Ha,

formerly the suggested symbol for the name hahnium, which was applied variously to two elements, now called dubniumdubnium
, artificially produced radioactive chemical element; symbol Db; at. no. 105; mass number of most stable isotope 268; m.p., b.p., and sp. gr. unknown; valence +5.
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 and hassiumhassium
, artificially produced radioactive chemical element; symbol Hs; at. no. 108; mass number of most stable isotope 277; m.p., b.p., sp. gr., and valence unknown. Situated in Group 8 of the periodic table, it is expected to have properties similar to those of osmium.
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.

HA

Abbrev. for hour angle.

ha

(mechanics)

Ha

(chemistry)
References in periodicals archive ?
HAH has received approvals to supply Dubai and Abu Dhabi and is awaiting the go ahead from Oman.
Akumal you will find Nah Hah at the end of the road, on an
The HAH scholarship will be offered to Head Start, kindergarten, first and second grade classes.
go ge g g eing aloneg HaH ppier times will Happier lie ahead.
Before I came up on stage, he went into this big spiel about how he was really surprised that he'd met me present"Befo into this really su before b imi pregnAmy, 2 hah d my nin ght an before because he hadn't tried to impregnate me.
cea S h Khah hahahahas pe But instead of watching Jools Holland with the missus, Chris, 34, has taken up the job with a rider including free VIP tickets 34343 , hah s ta ririrideder into watch tennis ace Roger Federer and Novak Djokovic's opening games, a pounds 3,000 a night suite at Emirates Palace, and a helicopter to and from the gig.