what does this schematic symbol mean?

[pinkjimiphoton]

i've never seen it before...



is it a pot with two of the lugs tied together?

it's from analogguru's FET booster..

thanks folks!

[frequencycentral]

Trimmer, with lugs 1 and 2 tied to ground.

TP1= Trim Pot 1

[Fender3D]

It's a trimmer with 2 lugs tied together.

Edit:

Rick you beat me...

[pinkjimiphoton]

thanks guys!! i learn a lot here, for sure! thanks for the speedy response! 

[Gurner]

You'll often hear such a beast referred to as a rheostat.....such a config turns a pot or trimmer (which is what the symbol is) from a potential divider into a simple two legged variable resistor.

[Ice-9]

You'll often hear such a beast referred to as a rheostat.....such a config turns a pot or trimmer (which is what the symbol is) from a potential divider into a simple two legged variable resistor.

I always though a rheostat was a wire wound pot, and rather large component compaired to a trim pot.

[Gurner]

I always though a rheostat was a wire wound pot, and rather large component compaired to a trim pot.

Rheostats are quite often used with higher currents (ie wirewound), but that usage/term is not exclusive.

For example, when buying digital pots you have the option of a standard (three terminal)  pot or a rheostat version (two terminal/variable resistor)... to prove my point, have a look at the top right of this digipot datasheet http://ww1.microchip.com/downloads/en/DeviceDoc/21978c.pdf - these digipots are very low (non wirewound!) current devices ....so the term rheostat has now morphed into a way of differentiating the intended use/config of a pot.....three terminal (potential divider) or two legged rheostat (variable resistor)

[Minion]

I allways called that pot wiring configuration a variable resistor as opposed to a voltage divider like a volume pot is wired .....

[Gurner]

I allways called that pot wiring configuration a variable resistor as opposed to a voltage divider like a volume pot is wired .....

Which is perfectly reasonable ....but the IC manafacturers have now taken a penchant to calling such variable resistors rheostats....I guess it removes any potential for doubt (whilst a volume pot is clearly a potential divider, it achieves this by having a variable resistance on the wiper  ....& let's face it - rheostat is a cool name, we don't often get to use an "h" after an "r" & I was getting sick of singing Rhinestone Cowboy to fulfill this need)