•Primary (1°) carbon:  a C
 bonded to one other carbon
 •Secondary (2°) carbon :  a
 C bonded to two other carbons
 •Tertiary (3°) carbon :  a
 C bonded to three other carbons
 •Quaternary (4°) carbon :  a C bonded to four other carbons
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 •Primary (1°) hydrogen:  a H
 bonded to primary (1°) carbon
 •Secondary (2°) hydrogen :  a
 H bonded to secondary (2°) carbon 
 •Tertiary (3°) hydrogen :  a
 H bonded to tertiary (3°) carbon