The silver band shows which end is the negative (Cathode) end. If you are using it as a blocking diode, the other end (+ve Anode) should be connected to the +ve supply. Power will pass through and be available at the end with the stripe. If you put it the other way around, it will block the current.
A light Emitting Diode.... Light Resistat Diode ...
MAN THAI means manufactured in Thailand.
LED: light emitting diode. It is a diode that emits light when current passes through it
Peak reverse voltage of a diode is the maximum reverse bias voltage can be applied to diode which does not cause break down.
SN14K likely indicates that the wedding band is made of sterling silver (S) and is plated with 14 karat gold (14K). This type of jewelry typically combines the durability and affordability of silver with the luxurious appearance of gold.
"nanometer" or billionths of a meter. 650 nanometers is the wavelength of the light produced by the diode.
light emitting diode and its a diode that emitting the light when the current passes through it and it used in the TV screen
Light Emitting Diode.
Liquid Crystal Diode.
light emitting diode
I think you mean 'diode valve'! A 'valve' is the British term for what Americans call 'tubes' or, more accurately, 'vacuum tubes'. So, a 'diode valve' is a thermionic valve generally used as a rectifier, much in the same way that a semiconducting diode is used, these days.
The stamp "NV" inside a silver ring typically refers to the metal purity, meaning "925" which is the standard marking for sterling silver. The tanzanite stone and possible diamonds or CZ's indicate the presence of gemstones in the ring setting.