Unicode symbols are often call Glyphs and they draw a lot of attention in a subject line when used on occasion to draw a little extra attention. There are thousands and thousands of available Glyphs that you can use.
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Proven Subject Line Types for Increased Open Rate
In looking at our own data and when weighing in with other industry experts like Digital Marketer we have nailed down 4 core types of subject line copy that consistently drive the top results.