Gold wire on black background – Is “best” and used on Number Ones [best[ uniform jacket

Red cotton stitched on black background is “casual / working” and used on Number Twos uniform jacket

Blue printed on white background is used on standard working uniform Number Eights shirt sleeve

Basic device – On joining branch after basic training

Basic device with star above – Qualified for Able or First class rate

Basic device with star above & below – qualified professionally for Leading rate

Basic device with Crown above – Qualified professionally for Petty Officer rate

Basic device with Crown above, star below and 3 buttons on cuff of each jacket sleeve – Qualified for Chief Petty Officer rate