PLT Symbols # symbol 0 Open Square 1 Open Circle 2 Open Erect Triangle 3 Open Inverted Triangle 4 Open Diamond 5 Hourglass 6 Asterisk 7 Plus 8 Picnic Table 9 Up Arrow 10 Filled Square 11 Filled Circle 12 Filled Erect Triangle 13 Filled Inverted Triangle 14 Filled Diamond 15 Fillid Hourglass 16 BTNI logo