Keychain Keyhole Keyboard House key Door key Keystone Keynote
Less than
The Skeleton Key.
Echoing a key phrase or word
Echoing is a key phrase or word is a way to establish a firm connection. You can find more general business terminology on internet.
Sypher means key word or phrase and riddle or a puzzle
The word could be crux, focus, essence, or core.
To seek attention to that phrase or word
keyword is a single word may be it organic or inorganic but when it comes with bunch as two or three words it is called as key Phrase. If you wish to target for specific product or Article or website you should have to use key phrase to get better ranking in SE and relevant users.
The Hasselblad 500cm camera is a medium format film camera known for its high-quality images and durability. Key features include a modular design, interchangeable lenses, a waist-level viewfinder, and a leaf shutter. Specifications include a 6x6 cm image size, a maximum shutter speed of 1/500s, and compatibility with various film backs and accessories.
The Key Word or Phrase Delivery Outline, see the link below.
If you mean abbreviate, it is to shorten a word or phrase by omitting letters, as in NW for North West of ft for feet or foot