Most equipment slots accept any type of Mod. However, some slots are “polarized.” Each type of Polarity has a unique symbol. Polarities include: * Madurai - V (Damage, Powers) - Commonly dropped by Grineer. * Vazarin - D (Defensive, Health, Armor) - Dropped by all factions. * Naramon - Dash/Bar (Misc.) - Commonly dropped by Corpus. * Zenurik - Scratch (Warframe Augments and Channeling Mods). * Penjaga - Y (Companion Abilities) - Dropped by all factions. * Unairu - R - Introduced in Update 13.0 and used for certain .