Ideas for CSS class name pairs

CSS class name pairs that I'm currently using:

• .w_row
  • .w_col
• .w_line
  • .w_unit
• .w_wrap
  • .w_area

Unorganized possibilities for the future:

• .cell
• .box
• .item
• .set
• .subset
• .pod
• .area
• .lot
• .block
• .frame
• .space
• .part
• .section
• .wrap
• .grid
• .slot
• .acre
• .plot
• .table
• .record
• .node
• .field
• .entity
• .period
• .group
• .well

... I'm running out of ideas here; nothing seems as good as .row/.col (other than .line/.unit). :(