From Old School RuneScape Wiki
Abbreviation
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Meaning
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M, Mil
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Million (e.g. 6M = 6,000,000)
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Mage, Mager
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Referring to the Magic skill, a player who uses Magic more than Ranged or Melee; an NPC wizard; a player with 99 Magic; a player currently using Magic for combat.
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Mage tank
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Player with high Magic and Defence.
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Main
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A player's main character; in the context of PVP, an account with no restrictions imposed on its combat stats.
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MB
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Mage bank (the Mage Arena in Deep Wilderness), Mage box (used in duelling), or "my bad" meaning sorry
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Maul
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Granite maul, Obsidian maul
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Mauler
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Player who uses a Granite maul, or Obsidian maul as their weapon.
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Max, Maxed, Maxing
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To reach level 99 in all skills ("I maxed yesterday"); to deal the maximum amount of damage in one hit ("my max is 32 with this gear"); a player with a combat level of 126 (often referred to as "maxed cb" or "max melee").
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MD
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Melee distance
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Med (helm)
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A regular helm, after the old name, medium helmet.
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Med level
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Short for "medium level" (content, gear, mobs, etc); in context of PVP, an account with between 50-75 attack and/or defence.
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Mem, Memb, P2P
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Member
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Mep1, Mep2
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Mourning's End Part I and Mourning's End Part II
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Merching, Merch, Merchanting
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Usually means the buying of an item then selling that same item later on in order to make a profit.
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Meta
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"Most Effective Tactic Available" or the dominant strategy, referring to the best or most popular method used in a scenario such as Skill training, Bossing, etc.
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Mith
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Mithril
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Mlm
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Motherlode Mine
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MM1, MM2
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Monkey Madness I and Monkey Madness II
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Money snake/Money dragon
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Terms for Zulrah and Vorkath, respectively; refers to their status as consistent moneymaking methods.
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MSB
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Magic shortbow
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Mta
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Mage Training Arena, north of the Duel Arena
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