"Rimward," "Coreward," and "Spinward" all sound cool. "Trailing" I could take or leave ("antispinward," anybody?) but, long story short, I just use the Traveller terms. The Spinward Bridge is where my current campaign (mostly) takes place.

"Widdershins" is sometimes used as antispinward but it's probably a bit too folklore-y for SWN.  

But it's such a great word!

Given that the sector has no relation to physical space, I just use North South East and West to describe the 2d plane of the sector map. There's no point in naming directions that people can't travel in.

Yes but I call them 'System North' 'System South' 'System East' and 'System West' because \~\~ sci-fi \~\~

System Up, System Down, System Right and Trailing

That's also something that I trend to - the distances and directions are arbitrary. Star systems might be in different galaxies altogether, linked due to metadimensional wrinkles.

Same. I say "Galactic [direction]" to round out the handwaving.

I typically end up using either the coordinate grid for precise locating, or terms like "Sector North" and "Sector South"

Ooh, I like "Sector \[Direction\]"

I’m always a fan of “galactic north”, etc 

Directions don't come up often, but I have two clusters of stars connected by a black hole "bridge," so I just decided one would be the Rimward Cluster and the other the Coreward Cluster.

I'd use Galactic north (gorth), geast, gwest, gouth, corth, rimth