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Why do people call it a "DI" if it's an output?

Direct Injection refers to the fact that it can be plugged straight into the board. The signal is balanced and at the right impedance so you get the full range of frequencies and lower noise.

Nomenclature is a funny thing, it's the same as when people say "the input jack on the bass", really they are describing the output jack but because it goes into the input of the amp many call it an input jack.

Thank heavens speaker outputs are called exactly that...
 
I have a Effectrode Blackbird. There's a balanced output at 600 ohms via a TRS jack. Why don't they call it a "DI" out ? I use a TRS to XLR adaptor and plug it into the XLR line in of my Quilter Bass Block 800, I guess it works exactly as if it was a regular XLR DI out…

I asked them by email 'is it a DI or not?', and here's the answer (doesn't really answer my question):

The following is from the Blackbird manual:
'Balanced Direct Out ¼” TRS (stereo) jack socket allows connection of the Blackbird to mixing desk, computer soundcard or external audio capture device. This output is balanced and transformer isolated, eliminating earth loops and reducing hum to an absolute minimum. The Triad Magnetics audio transformer also imparts it’s own character, further enhancing and sweetening the tone. This output is driven by a discrete class AB amplifier circuit – essentially a miniaturised power amp output stage. There’s no substitute for the sound of a real tube amp moving some air, however the direct output is useful for recording in venues with poor room acoustics or excessive background noise. Reverb, eq or cabinet impulse responses can be added post recording to obtain a very realistic approximation of a miked guitar amp in an ideal acoustic space.'​
 
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