text message
Definition:
A text message is a short (160 characters or less) message sent between two mobile phones. Text messaging is available on most digital mobile phones but depending on your calling plan you may incur additional per message charges to send and receive text messages.
Here's a word you may not know...
special characters
In the world of technology, special characters are known as the characters on a computer keyboard (although not restricted to just the characters on a keyboard) other than a-z (lowercase), A-Z (uppercase) and 0-9. Examples of special characters are !, #, &, " and +.
If a web site asks you to create a password and tells you that special characters are not allowed then orangejuice would be a valid password but *range-ju!ce would not.