Envelope

Meanings

A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.
To surround or enclose.

Envelope: An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional
Red envelope: A red envelope, red packet, hongbao or ang pau (traditional Chinese: 紅包; simplified Chinese: 红包; pinyin: hóngbāo; Pe̍h-ōe-jī: âng-pau) is a gift of money
Envelope (music): In sound and music, an envelope describes how a sound changes over time. For example, a piano key, when struck and held, creates a near-immediate initial