Handstamp : A postmark or overprint applied by hand

Hinges : Small strips of gummed material used by collectors to affix stamps to album pages.

High Value : The term applied to stamps which represent a higher value of postage. Not to be confused with the actual market value of a stamp.

Hologram : An image that appears to be three-dimensional when viewed from an angle. Holograms have appeared on some modern stamps and stationary.