ΘΔ - What does ΘΔ mean?

ΘΔ is slang for "Therian." See an example of how people use it.
When you see the symbol ΘΔ in someone's social media bio, it means they are a therian. You might see therians use this symbol on Twitter, TikTok, Instagram, and other platforms, to identify their kinship with an animal.

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Caeser - Dicko ΘΔ - 🐺 (@boingboingm8) / X

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A schematic outline how the model captures the sequential nature of

Vustex ΘΔ, technically a viking (@Vustex) / X

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Additional incremental impact of outdoor contact toxins (θμ,pre,o =

Non-equilibrium critical dynamics of bursts in θ and δ rhythms as fundamental characteristic of sleep and wake micro-architecture