Almost literally means the "calm before the storm", but can also be used to signify joy, tranquility, etc.
Goodbye Halcyon Days.
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A remote island full of sexy, cute and pretty ladies. A place to sit back, relax and enjoy the awesome view. Leave all your worries and stress behind. Find it on tumblr. Search for halcyon-island tumblr
A: I went for a holiday at the halcyon island.
B: Where is it located?
A: It's on tumblr. Just type this into your address bar and hit enter "halcyon-island dot tumblr dot com"
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Any solar system orbiting an object that was once a main sequence star, but isn't anymore (i.e. black holes, white dwarves, red giants, magnetars, pulsars, etc.).
The solar system will become a halcyonic system as the Sun dies.
Just a passerby who you'll either come to love or hate (or neither). He's cooler than boredd and to be friends with him requires a lifetime's worth of luck. He prefers honesty and transparency.
Halcyon™ is a nice friend to have.
Any planet in a halcyonic system (i.e. KMT-2020-BLG-0414L b, WD1054–226 b, WD 1856 b, etc.)
There are also halcyonic dwarf planets, the only example of which is WD 1145+017 b.
In 2020, we discovered the first halcyonic planet around a white dwarf.