Introduction to typography - Part 1

I have been wanting to write a series on typography and here is the first part wherein I will be discussing the anatomy of type.

Characters: The individual letters, punctuation, numerals, and signs.

Uppercase: The capital letters of the alphabet. 

Lowercase: The small letters of the alphabet. 

Baseline: An imaginary line on which the characters seem to be standing. 

Meanline: An imaginary line that runs along the top of most of the lowercase letters like a, c, e, i, m, n, u, v, w, and x i.e., letters without an ascender and descender. 

X-height: The distance between the baseline and the meanline. 

Ascender: The part of some lowercase letters that rise above the meanline like in b, d, h. 

Descender: The part of some lowercase letters that fall below the baseline like in p, y and g. 

Counter: The space entirely or partially enclosed within a letter, such as the enclosed bowl of b, d, e, p. 

Serif: The finishing strokes that project from the main stroke of a letter. 

San serif: Letters without serif. 

Small caps: Capital letters of the alphabets that are the same size as the x height. 

Modern figures: Numbers that resemble caps by being uniform in height. 

Old style figures: Similar to lowercase characters and may have ascenders and descenders. 

Ligatures: Two or more characters joined as a single unit. 

Anatomy of type.