Mendeleev's predicted elements
Dmitri Mendeleev published a periodic table of the chemical elements in 1869 based on properties that appeared with some regularity as he laid out the elements from lightest to heaviest. When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that as-then-unknown elements existed with properties appropriate to fill those gaps. He named them eka-boron, eka-aluminium and eka-silicon with atomic masses 44, 68 and 72 respectively.
Pier table
The pier table takes its English name from the "pier wall", the space between windows. The table was developed in continental Europe in the 1500s and 1600s, and became popular in England in the last quarter of the 1600s. The pier table became known in North America in the mid-1700s, and was a popular item into the mid to late 1800s. It was common for the space between the rear legs of the pier table to contain a mirror, or "pier glass", to help hide the wall. Later pier tables were designed to stand in any niche in a room, and the pier glass moved above the table.