MRQ1 and MRQ2 are Mongoose's 1st and 2nd editions, although Mongoose themselves might have been happier had the RQII acronym caught on for their product because of its generally more favourable associations with Chaosium's RQII as opposed to the less-than-stellar MRQ1.
OGL is Wizards of the Coast's (WotC) Open Gaming Licence.
SRD is a System Reference Document. MRQ1 was OGL with an SRD and so let the cat out of the bag with many previously Gloranthan-only terms such as Dragonewts, Gorp, Runes (just the names, not the depictions) and so forth. That means that 3rd-party publishers can use those terms in their products. Because you can change anything in an SRD, you are not bound to follow it (i.e. you can tweak the rules or re-write them completely), but it does allow you access to some words which would otherwise be Intellectual Property (IP).
Spend a few years in the Traveller (CT/MT/TNE/T4/T20/HT/GT/MGT/T5) community and you'll soon get used to acronyms. IIRC. IMHO. YMMV.
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Vile
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