Semantic Superpower/Sandbox

A power that that is loosely defined and thus capable of a great deal of stretching what it is capable of. An example would be a hypothetical power of 'Pushing' being used to 'push' people at massive speed in order to fake teleportation, to push concepts or to push away attacks.

See also Imagination Based Superpower and Swiss Army Superpower.

Anime and Manga

 * In Maken Ki, this is how Celia's "reverse" power works. Normally, she just uses it to reverse someone's momentum when they attack her, and for a while everyone assumes that's all she can do. However, she can also reverse a fighter's strength (making them weak), reverse the Determinator's aggression (turning him into an apathetic mess) and.
 * It's common in One Piece for Devil Fruit users to not have any obvious limits to their powers. A good example is Kuma, who has the power to repel things. He often uses this to repel attacks, but it turns out he can repel the pain from a person's body. In fact, it's stated that one of the true marks of a strong fruit user is how much experience they have with their powers and by extension, how many of these uses for their powers they can figure out.
 * Aphorism is literally this. All the powers of the characters are based on a single kanji. Someone with the character for "flame" can produce flames, for example..

Comic Books
""I can use a mirror a thousand different ways. Can turn a man inside out. Cut a hole through a seven-foot concrete wall. Make ye see things from yer fantasies--or from yer worst nightmares." (The Flash vol. 2 #212)"
 * Mirror Master, one of The Flash's enemies, can do just about whatever the writer can imagine as long as it involves light and/or glass, up to and including creating entire mirror universes.

Video Games

 * Yukari Yakumo of the Touhou series is pretty much the embodiment of this trope, for the fanon at least. Her power is, as stated in the manual, control over borders, which doesn't sound too great until you realize that "border" is meant in the most metaphysical way possible. By tweaking things like the borders of life and death, reality and fantasy, possible and impossible, etc, she's basically God. Maybe. The creator is rather vague about whether she has any limits (cue the fans coming in and claiming that even if she had limits she'd remove them with her power) but it's generally agreed that you shouldn't mess with her.

Webcomics

 * The titular Keys of the Exalted webcomic Keychain of Creation have the simple ability to unlock things, including the seals on the local Cosmic Horrors. However, according to Word of God, obtaining all five Keys grants the wielder omnipotence, as long as they can phrase the desired action as "unlocking." For example, the Deathlords are immortal, or one might say "locked" to life, and thus can be killed with proper use of the Keys.
 * Parodied by Eight Bit Theater: Red Mage is constantly showing his companions One Stat to Rule Them All versus a Dump Stat. Lockpicking can be accomplished, for instance, using the pickpocket skill because it's just removing a lock from a pocket in a door. The interrogation skill is simply emptying pockets of information in people's minds. This being 8-Bit Theater, Insane Troll Logic is completely applicable if you're stupid enough to not wonder how it's at all possible.