**NOT**gate.

In Symmetric Ternary logic, 5 inverters can be made. We will consider only three of them because these gates are used in ternary computing.

The first gate is called

**Simple Ternary Inverter**or

**STI**. We described it in one of earlier post. The truth table for it looks like this:

There exists also a

**Positive Ternary Inverter**or**PTI**. The truth table is represented below:
Finally, we have the

**Negative Ternary Inverter**or**NTI**. The truth table looks like this:
The combination of these logic gates with other ones can produce the circuits that we need in ternary calculations, such as cycles. We will discuss them in another post. For now see below a short video how these three gates works. I connected

**NTI**and**PTI**to the output of**STI**:
Next time we will continue building this circuit to make a program counter.