In British English, quotation marks are often called inverted commas. Also known as quote marks, quotes, and speech marks. In the U.S., periods and commas always go inside the quotation marks. In the U.K., periods and commas go inside the quotation marks only for a complete quoted sentence; otherwise, they go outside. In all varieties of English, semicolons and colons go outside the quotation marks. Salutations are greetings, said the voice.
IR stands for Infared and means the remote must be pointed directly at the receiver. RF stands for Radio Frequency and means the remote is multi-directional. You can tell what kind of remote you have by looking at the number in the upper-left corner of the remote. Examples are RC64R, RC65, RC65RB, RC65RX, etc.
There are two different frequencies, in two entirely different contexts, involved. The infrared light generated by an infrared LED is in the 300+ GHz range, this is correct. For instance, the TSAL5400 IR LED often used in remotes has its radiation peak at 940nm wavelength, i.e. 318,930 GHz. However, IR remote controls do not output continuous infrared light. The LED output is chopped via control circuitry into pulses of a given frequency, such as 34 KHz, 38 KHz, 40 KHz or 56 KHz. The IR sensor at the other end filters incident IR at the specified frequency, and ignores any IR that does not conform to this chopping frequency or modulation. This ensures that stray infrared light, such as from sunlight, heat sources, or incandescent lamps, is ignored by the sensor, and only the correctly modulated incoming IR is acted upon.