Electronic – Unknown Component

Looks like an 10kΩ NTC. Most NTC's aren't visibly branded, but the resistance at 25 degrees is the property that they are sold by.

Although chances are very slight that it is actually a Vishay part, this page lists a some datasheets for similar devices. Checking the datasheets for a similar part might give you a good feeling for how the device responds to temperature.

Unless you get lucky and find a whole part number (as in the 1N4148), you're better off measuring. Get a 20 V supply or so and a 2 kΩ resistor. Most diodes (other than LEDs, but that's not the issue here) aren't going to be damaged with either 20 V reverse voltage or 10 mA thru them either way.

Connect the 20 V with the 2 kΩ in series to each diode and measure the voltage. With the + to the anode and - to the cathode (striped end), all the diodes should measure around 700-800 mV. If a diode measures 20 V that way, then it's blown. If it measures about half that, then it's a Schottky and not a zener.

Now flip the diode around and measure the voltage again. This will show you the Zener voltage. Put them in bins accordingly. If a diode measures the full 20 V, then it's either not a Zener (like the 1N4148), or its Zener voltage exceeds 20 V (unlikely).