Learn English – it called when a snake is showing its head when angry

It’s a book-plate, in the OED’s definition:

A label, usually pasted inside the front cover of a book, bearing the name or crest of the owner, or other device indicating ownership, position in a library, etc.

Net profit is a proper definition or net financial result:

• Often referred to as the bottom line, net profit is calculated by subtracting a company's total expenses from total revenue, thus showing what the company has earned (or lost) in a given period of time (usually one year). also called net income or net earnings.

Source: (www.investorwords.com)