well in darkness you can see the following; palkia cresselia darkrai and mayby dalga

It is called the Autumnal Equinox. It is the day of equal daylight and darkness following the Summer Solstice.

The first day of Spring is called the Vernal Equinox. It is the day of equal daylight and darkness following the Winter Solstice.

It could have several different meanings depending on the kanji used. Yami means dark or darkness, but "shin" has many different meanings, so the phrase could mean any of the following:

Dark Mind/Mind of Darkness

Dark Heart/Heart of Darkness

Dark God/God of the Dark/God of Darkness

Dark Forest

Dark Wood

New Darkness

Parent/Kinship of Darkness

True Darkness

Core of Darkness

Dark Water

Trust in Darkness/Faith in Darkness

Without context it's hard to determine which meaning is meant.

hehehe

Val Kilmer