Yahweh Shammah (yah-WEH SHAM-mah) or Jehovah Shammah (jeh-HO-vah SHAM-mah) is יְהוָֹה שָׁמָּה in Hebrew. It means "the Lord is There". Yahweh focuses on God being Lord. Shammah means there. The main scripture Yahweh Shammah is used in is Ezekiel 48:35 to really display who God is in this name.
Yahweh Shammah signifies how God is always there for His people. His presence is never absent in the world. God is permanent. His presence is restorative. It means you can have a real intimate relationship with your creator. The name signifies God's character at keeping His word. If He promised it, then it will happen.
When you pray using Yahweh Shammah you are entering God's presence with the trust that He will uphold His promises. You are seeking to be closer and submit to His authority even if it doesn't look like you want it to look like.
You go before Yahweh Shammah submissively expecting good things even when you have to change your perspective to get them. You trust Him to restore you and your hope after trails and tribulations. When you do not feel God's presence, but want to cry out to Yahweh Shammah to remind yourself that He is still there. He will uphold you.
Psalm 139:7-12, Isaiah 41:8-10, Ezekiel 48:30-35, Matthew 1:23, 28:16-20, & John 14:15-21