Oh and just in case you wonder why i considered Harry potter theories to be a reasonable source for retrieving the information you’ve asked about.
Here’s J.K.Rowlings Sigil she attached to the dark arts in her books.
So techniquely,
her spells are usable in our magick.
In not directly,
then at least their mechanisms.
To further verifiy that sigil,
and explain it’s meaning,
here’s J.K.'s own words on it:
J.K. Rowling Verifizierter Account @jk_rowling 5. Sept. Sometimes, darkness comes from unexpected places #HarryPotter #CursedChild
Harry-Potter-Cursed-Child-Movie-Logo,
or the-dark-mark, are considered the naming of the sigil.
So technically,
it represents the Death Eaters,
at least it should be possible to access them through evocation.
I think for general understanding,
it’s safe to assume,
that sigil to be Voldemorts sigil.
Since the V, the shape of the Snake-Vampiric face,
and the Snake head being open and attached to the Crown Chakra,
pretty much all represent identification values to connect with Voldemort.
So,
consider it “Voldemorts Sigil”,
unless proven otherwise through Gnosis from Evokation.
Oh, and here’s an unofficial movie,
regarding the topic.
If someone feels well connected to the content,
charging the Sigil with the Impressions gained from that movie,
for empowering it,
and making it more accessable to our Magick,
might be helpful.
Simply gaze the Sigil,
after you’ve watched the Video,
create an counter-clockwise insucking Thunnel-Vortex from your Agnja Chakra or Wajet Eye into it,
and push the Sensations,
and impressions,
and especially the emotions,
you’ve gained from watching the movie,
into the Sigil.
Let it absorb that Content completely,
charge it with Dark Energy,
and conceal it once done.
You can add a drop of blood,
to the sigil,
if you want to empower it further,
but not necessary.
That way,
the Sigil definately gains enough Energetic essence,
to conduct it’s supposed meaning for other practitioners.
The Movie:
Thank you,
for participation.
Sincerely,
¥’Berioth