2. [MIT] Name used by some people for the # character (ASCII 0100011).
3. The feature key on a Mac (same as alt, sense 2).
4. obs. Name used by some people for the Stanford/ITS extended ASCII ⊗ character. This character is also called blobby and frob, among other names; it is sometimes used by mathematicians as a notation for tensor product.
5. obs. Name for the semi-mythical Stanford extended ASCII ⊕ character. See also ASCII.