High Grade (HG) is a line of Gunpla kits by Bandai. These kits feature a better range of motion and greater possibility than most No-Grade kits. It is important to note that 1/100 scale models for Mobile Suit Gundam SEED, Mobile Suit Gundam SEED Destiny, Mobile Suit Gundam 00, and Mobile Suit Gundam IRON-BLOODED ORPHANS do not have HG listed anywhere on the box or manual, but they are considered comparable to High Grade in terms of quality.

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The HG moniker has also been used in other anime and sci-fi kit lines such as Neon Genesis Evangelion, Aura Battler Dunbine, Pacific Rim: Uprising, Full Metal Panic!, Dynamic Characters, Nekketsu Saikyō Go-Saurer, Sakura Wars, Mashin Hero Wataru, Amaim Warrior at the Borderline, and Macross.

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Reference: https://gundam.fandom.com/wiki/High_Grade