esp8266 memory problems

Wooo I write this in the console:

what is that: ----> "ÿ"

>E.getSizeOf(global, 1)
=[
  {
    "name": "ÿ",
    "size": 354 },
  {
    "name": "Modules",
    "size": 3 },
  {
    "name": "ssid",
    "size": 3 },
  {
    "name": "pass",
    "size": 3 },
  {
    "name": "ApiKey",
    "size": 5 },
   ...
  {
    "name": "Restart",
    "size": 2 },
  {
    "name": "process",
    "size": 3 },
  {
    "name": "httpCRs",
    "size": 8 },
  {
    "name": "httpCRq",
    "size": 8 },
  {
    "name": "JSON",
    "size": 2 }
 ]
>