Halftone:
A tone that is halfway between highlight and dark shadow. The tones are broken up by fine screen into different sizes of dots.

Head:
Line on the top of the body of content which is in big and bold fonts.

Hexadecimal:
A number system used for web colors. The first six numbers used in this 16 based numbering system are 0-9 and the next 5 are A-F.

HTML:
(Hypertext Markup Language) Standard language used to communicate with internet.