Common Casing Styles

TitleCase

also known as PascalCase, UpperCamelCase, StudlyCase

• first letters are upper
• no separation char
• https://en.wikipedia.org/wiki/Title_case

camelCase

also known as lowerCamelCase, dromedaryCase

• first letter is lower
• first after separation is caps
• no separation char
• https://en.wikipedia.org/wiki/Camel_case

Train-Case

also known as HTTP-Header-Case

• first letters are upper
• separation char is dash

kebap-case

also known as dash-case, lisp-case, spinal-case

• all letters are lower
• separation char is dash
• https://en.wikipedia.org/wiki/Letter_case#Kebab_case

SHOUTY-KEBAP-CASE

also known as SCREAMING-KEBAP-CASE, COBOL-CASE

• all letters are upper
• separation char is dash

snake_case

also known as pothole_case

• all letters are lower
• separation char is underscore

SHOUTY_SNAKE_CASE

also known as SCREAMING_SNAKE_CASE, MACRO_CASE, CONSTANT_CASE

• all letters are upper
• separation char is underscore

camel_Snake_Case

• first letter is lower
• first after separation is upper
• separation char is underscore

Pascal_Snake_Case

also known as Title_Snake_Case

• first letters are upper
• separation char is underscore

aLtErNaTiNgcApS

also known as "sTuDlYcApS", "sTiCKycApS"

• random, or custom arbitrary rules for casing
• https://en.wikipedia.org/wiki/Alternating_caps

flatcase

• all letters are lower
• no separation char

UPPERFLATCASE

• all letters are upper
• no separation char

I want to know more...

https://en.wikipedia.org/wiki/Naming_convention_(programming)#Multiple-word_identifiers