How to Sign "Envelope"
To sign 'envelope,' hold your non-dominant hand in a loose 'C' shape in front of you, with the palm facing inward, representing the opening of the envelope. Form a flat 'O' shape with your dominant hand, keeping your fingers and thumb pinched together to represent a folded letter. Slide your dominant hand down and into the opening of your non-dominant hand, mimicking the action of inserting a letter into an envelope.